Thermal and Mechanical Properties of Diblock Copolymers Based on 2,2-Dimethyltrimethylene Carbonate andɛ-Caprolactone
| Autor: | Massimo Baiardo, Giovanni C. Alfonso |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Materials science
Polymers and Plastics Enthalpy of fusion Organic Chemistry Young's modulus Condensed Matter Physics law.invention symbols.namesake chemistry.chemical_compound Monomer chemistry law Polymer chemistry Materials Chemistry symbols Copolymer Carbonate Physical and Theoretical Chemistry Trimethylene carbonate Crystallization Caprolactone |
| Zdroj: | Macromolecular Chemistry and Physics. 202:2509-2517 |
| ISSN: | 1521-3935 1022-1352 |
| DOI: | 10.1002/1521-3935(20010801)202:12<2509::aid-macp2509>3.0.co;2-t |
| Popis: | Tri(sec-butoxyaluminium) [Al(Osec-Bu) 3 ]- initiated copolymerization of 2,2-dimenthyl trimethylene carbonate (DTC) with e-caprolactone (CL) by stepwise addition of the monomers leads to high-molecular weight block copolymers of the AB diblock type. By changing the amount of initiator and the molar ratio of the monomers, several diblock copolymers were prepared having either the same composition with different overall molecular weight or the same PDTC block length with various compositions. The thermal and mechanical properties of the copolymers were studied with the aim of assessing their dependence on molecular characteristics. Ageing time at room temperature was found to have a remarkable effect on tensile modulus and on melting of the ordered PDTC phases. This behavior has been attributed to mutual hindrance of the blocks on their crystallization and to a solid-solid polymorphic transformation taking place in the crystalline PDTC microphases. |
| Databáze: | OpenAIRE |
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